HP XP P9500 Storage - Manual (Page 22)

Description Term
You can set the percentage of THP-VOL capacity that can be created to the total capacity
of the pool. This can help prevent THP-VOL blocking caused by a full pool.
For example, when the subscription limit is set to 100%, the total THP-VOL capacity that
can be created is obtained using this formula:
total THP-VOL capacity <= pool capacity x 100%
Using this setting protects the pool when doing the following:
• Shrinking a pool
•
Creating THP-VOLs
• Increasing THP-VOL capacity
The value of the reached maximum I/O counts that each tier can process. tier boundary
A combination of determining the appropriate storage tier and migrating the pages to
the appropriate tier. tier relocation
A storage hierarchy of layered structures of data drives consisting of different performance
levels, or tiers, that match data access requirements with the appropriate performance
tiers. tiered storage
A virtual device in the storage system. A VDEV is a group of logical volumes (LDEVs or
logical units) in a parity group. One parity group consists of multiple VDEVs. A VDEV VDEV
usually includes some fixed volumes (FVs) and some free spaces. The number of FVs is
determined by the emulation type.
A volume in which a fixed-sized volume is divided into arbitrary sizes. variable-sized volume (CV)
Before you begin
Before you begin provisioning your P9500 storage system, certain requirements must be met.
System requirements
•
The P9500 hardware, microcode, and Remote Web Console essential for operating the
storage system be installed and configured for use.
•
A P9500 storage system.
•
The storage system must have parity groups installed.
•
A Remote Web Console client computer.
Shared memory requirements
If configuring thin provisioning, Thin Provisioning requires dedicated shared memory for the V-VOL
management area.
The V-VOL management area, which is automatically created when shared memory is added, is
an area used to store information for associating pool-VOLs and THP V-VOLs.
If Thin Provisioning is used, at least 16 GB of shared memory consisting of two sections is required.
The memory capacity allocated to each part is as follows:
•
Basic part: 8 GB
•
Thin Provisioning: 8 GB
22 Introduction to provisioning